Mecalac Terex MBR71 Roller Pre-2020

The Mecalac Terex MBR71 Roller (pre-2020 chain-driven models) is a reliable piece of equipment, but, like any machinery, it can encounter some common issues due to wear, usage, and maintenance practices. Here are the most frequent problems reported with this model and their potential causes:

1. Chain Drive Wear or Failure

Issue: The chain drive system, used to transmit power from the engine to the drum, can wear out or fail over time.
Causes:
- Lack of lubrication or improper chain tension.
- Excessive dirt, debris, or corrosion causing wear.
- Misaligned sprockets or a stretched chain.
Solution:
- Regularly inspect the chain for tension, wear, and alignment.
- Clean and lubricate the chain at recommended intervals.
- Replace worn chains or sprockets as needed.

2. Vibration System Issues

Issue: Loss of or reduced drum vibration, affecting compaction efficiency.
Causes:
- Worn or damaged eccentric weights or bearings in the exciter unit.
- Hydraulic or mechanical vibration motor malfunction.
- Broken drive belts or couplings powering the vibration system.
Solution:
- Inspect the exciter unit for wear or damage.
- Check and replace bearings and belts as necessary.
- Ensure the vibration motor is receiving adequate power or hydraulic pressure.

3. Hydraulic System Leaks or Failures

Issue: Hydraulic system problems can lead to issues with drum operation, steering, or vibration.
Causes:
- Damaged or worn hydraulic hoses and fittings.
- Contaminated hydraulic fluid or a clogged hydraulic filter.
- Failing hydraulic pump or motor.
Solution:
- Regularly inspect hoses, seals, and fittings for leaks.
- Change hydraulic fluid and filters as per manufacturer guidelines.
- Test and service the hydraulic pump or motor if performance drops.

4. Engine Performance Issues

Issue: Reduced power output or starting problems.
Causes:
- Clogged air filters or fuel filters.
- Contaminated fuel or old oil.
- Worn-out components like spark plugs or fuel injectors (depending on the engine type).
Solution:
- Clean or replace air and fuel filters regularly.
- Use high-quality fuel and perform scheduled oil changes.
- Inspect and service the engine according to the maintenance schedule.

5. Drive Belt Wear

Issue: Broken or slipping drive belts reduce the efficiency of both drum drive and vibration systems.
Causes:
- Excessive wear from prolonged use.
- Improper belt tension or misalignment.
Solution:
- Check belt tension regularly and adjust as needed.
- Replace worn or cracked belts immediately.

6. Drum Issues

Issue: Drum becomes misaligned or develops cracks, leading to uneven compaction.
Causes:
- Regular wear from heavy-duty use or impact with hard objects.
- Loose bolts or bushings in the drum assembly.
Solution:
- Inspect the drum for physical damage and alignment.
- Tighten or replace bolts and bushings if necessary.

7. Steering or Handle Vibrations

Issue: Excessive vibration felt by the operator, causing fatigue or discomfort.
Causes:
- Worn or damaged anti-vibration mounts.
- Excessive wear in the steering components.
Solution:
- Replace worn anti-vibration mounts to isolate vibrations.
- Inspect and repair steering components as needed.

8. Electrical Problems

Issue: Electrical components, such as the starter, lights, or switches, may fail.
Causes:
- Corroded or loose electrical connections.
- A weak or failing battery.
- Worn-out starter motor or alternator.
Solution:
- Inspect and clean electrical connections regularly.
- Replace the battery if it is unable to hold a charge.
- Test and service the alternator and starter motor.

9. Brake System Wear

Issue: Reduced braking efficiency, potentially dangerous on slopes.
Causes:
- Worn brake pads or shoes.
- Leaks in the braking system.
- Malfunctioning mechanical brake linkages.
Solution:
- Inspect and replace worn brake components.
- Check for hydraulic leaks or mechanical issues in the braking system.

Preventative Maintenance Tips

Daily Checks:
- Inspect the chain drive, hydraulic system, and belts for visible signs of wear.
- Check fluid levels (engine oil, hydraulic fluid, fuel, and coolant).
Regular Servicing:
- Follow the maintenance schedule for oil changes, filter replacements, and lubrication.
- Tighten bolts and ensure all parts are aligned and secured.
Keep It Clean:
- Clean the roller after use to prevent debris build-up, especially around the chain and drum areas.
Use Genuine Parts:
- Use manufacturer-recommended parts and fluids to ensure compatibility and longevity.

By addressing these issues proactively, you can minimize downtime and ensure your Mecalac Terex MBR71 operates at peak efficiency.